Evidence for a role of neosynthetized putrescine in the increase of glial fibrillary acidic protein immunoreactivity induced by a mechanical lesion in the rat brain.
The effect of alpha-difluoromethylornithine (alpha-DFMO), an irreversible inhibitor of ornithine decarboxylase (ODC) the rate limiting enzyme of polyamine biosynthesis, was studied on the astroglial reaction in a model of mechanical brain injury. alpha-DFMO markedly decreased the astroglial activation induced by the microdialysis probe implantation in the striatum of the male rat, as studied by glial fibrillary acidic protein (GFAP) immunocytochemistry. This response was restored by putrescine (20 nmol/ml) administered via the microdialysis probe. These results suggest that the astroglial reaction and the polyamine biosynthesis activation induced by a localized mechanical lesion are causally linked phenomena.
Zini
I
I
Institute of Human Physiology, University of Modena, Italy.
Zoli
M
M
Grimaldi
R
R
Pich
E M
EM
Biagini
G
G
Fuxe
K
K
Agnati
L F
LF
D000818:Animals; D001253:Astrocytes / Q000187:drug effects / Q000378:metabolism*; D001930:Brain Injuries / Q000378:metabolism*; D003342:Corpus Striatum / Q000187:drug effects / Q000378:metabolism*; D000518:Eflornithine / Q000494:pharmacology*; D005904:Glial Fibrillary Acidic Protein / Q000032:analysis / Q000096:biosynthesis*; D008297:Male; D011700:Putrescine / Q000096:biosynthesis* / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D012016:Reference Values
D005904:Glial Fibrillary Acidic Protein; D011700:Putrescine; D000518:Eflornithine